How did this happen to my pushrods?

..............I've seen at least 10 mopars with pushrod just like that..........kim...........
so have i

Sorry , there is no way that a .450 lift cam uses enough spring pressure to do that to a pushrod , it would have had to have been almost welded to the lifter and the rocker for that to happen.

A stock 383 2bbl engine has a .450 lift cam ...

100% agreed

i have ran a .509 in a BB with a completely stock valve train and pushrods with no problems ever